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# Solution for Find the Mean of Each of the Following Frequency Distributions Class Interval 50-70 70-90 - CBSE Class 10 - Mathematics

#### Question

Find the mean of each of the following frequency distributions

 Class interval 50 - 70 70 - 90 90 - 110 110 - 130 130 - 150 150 - 170 Frequency 18 12 13 27 8 22

#### Solution

Let the a assumed mean be 100

 Class interval Mid-value (x1) d1 = x1 - 100 "u"_1 = (x_1 - 100)/20 f1 f1u1 50 - 70 60 -40 -2 18 -36 70 - 90 80 -20 -1 12 -12 90 - 110 100 0 0 13 0 110 - 130 120 20 1 27 27 130 - 150 140 40 2 8 16 150 - 170 160 60 3 22 66 N = 100 sumf_1"u"_1=61

A = 100, h = 20

Mean A+hxx(sumf_1"u"_1)/N

=100+20xx61/100

=100+1220/100

= 100 + 12.20

= 112.20

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Solution Find the Mean of Each of the Following Frequency Distributions Class Interval 50-70 70-90 Concept: Mean of Grouped Data.
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